MAJOR INTEREST IN SHARES

1. Identity of the issuer or the underlying issuerof existing shares to which voting rights areattached:

IG Group Holdings Plc

2. Reason for the notification (please tick the appropriate box or boxes):

An acquisition or disposal of voting rights

An acquisition or disposal of qualifying financial instruments which may result in the acquisition of shares already issued to which voting rights are attached.

An acquisition or disposal of instruments with similar economic effect to qualifying financial instruments

An event changing the breakdown of voting rights

Other (please specify):

Due to a company reorganisation, Capital Research and Management Company ("CRMC") and Capital Group International, Inc. ("CGII") will no longer report relevant holdings under management separately. Instead the relevant holdings under management by CRMC and CGII will be reported in aggregate by The Capital Group Companies, Inc. ("CGC"). It is solely for this reason (and not as a result of any additional acquisition or disposal) that CGC is reporting this aggregated holding.

X

3. Full name of person(s) subject to thenotification obligation:

The Capital Group Companies, Inc.

4. Full name of shareholder(s)  (if different from 3.):

See Schedule A

5. Date of the transaction and date onwhich the threshold is crossed orreached:

3 September 2012

6. Date on which issuer notified:

19 September 2012

7. Threshold(s) that is/are crossed orreached:

Above 4%

8. Notified details:

A: Voting rights attached to shares

Class/type ofshares

if possible usingthe ISIN CODE

Situation previousto the triggeringtransaction

Resulting situation after the triggering transaction

NumberofShares

NumberofVotingRights

Numberof shares

Number of votingrights

% of voting rights

Direct

Indirect

Direct

Indirect

Direct

Indirect

Ordinary GBP0.00005

16,860,700

16,860,700

16,860,700

16,860,700

4.6408%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Expirationdate

Exercise/Conversion Period

Number of votingrights that may beacquired if theinstrument isexercised/ converted.

% of votingrights

n/a

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Exercise price

Expiration date

Exercise/Conversion period

Number of voting rights instrument refers to

% of voting rights

n/a

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

16,860,700

4.6408%

9. Chain of controlled undertakings through which the voting rights and/or thefinancial instruments are effectively held, if applicable:

See Schedule A

Proxy Voting:

10. Name of the proxy holder:

N/A

11. Number of voting rights proxy holder will ceaseto hold:

N/A

12. Date on which proxy holder will cease to holdvoting rights:

N/A

13. Additional information:

Notification using the total voting rights figure of  363,315,023

14. Contact name:

Bridget Messer

Company Secretary

IG Group Holdings plc

15. Contact telephone number:

+44 (0)20 7896 0011

Number of Shares

Percent of Outstanding

The Capital Group Companies, Inc. ("CG") holdings

16,860,700

4.641%

Holdings by CG Management Companies and Funds:

·; Capital Research and Management Company

16,860,700

4.641%

·; The Income Fund of America